regret---- regretted---- regretted
① regret+ n./pron.
③ regret to do sth 对要做的事遗憾。 (未做)
regret to say / tell / inform ... 遗憾地说（告诉等）
④ regret doing sth 对做过的事遗憾、后悔。 (已做)
regret having done sth. 对已发生的事感到遗憾
1. —You were brave enough to raise objections at the meeting.
―Well, now I regret ______ that.
A． to do B. to be doing C. to have done D. having done
2. He regretted ______ his father yesterday.
A. having not seen B. seeing not
C. not to see D. not seeing
3. I regret ______ that we have no news for you.
A. to say B. saying C. to have said D. having said
Key: 1. D 2. D 3. A